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  <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></div> <!----></nav>  <ul class="sidebar-links"><li><div class="sidebar-group first"><p class="sidebar-heading open"><span>part01.国内版Leetcode踩坑记录</span> <!----></p> <ul class="sidebar-group-items"><li><a href="/00.Coding/CodeWarehouse/part01.%E5%9B%BD%E5%86%85%E7%89%88Leetcode%E8%B8%A9%E5%9D%91%E8%AE%B0%E5%BD%95.html#_1）leetcode要求的函数返回值不合常理" class="sidebar-link">1）Leetcode要求的函数返回值不合常理</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/00.Coding/CodeWarehouse/part01.%E5%9B%BD%E5%86%85%E7%89%88Leetcode%E8%B8%A9%E5%9D%91%E8%AE%B0%E5%BD%95.html#_2）内部错误" class="sidebar-link">2）内部错误</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/00.Coding/CodeWarehouse/part01.%E5%9B%BD%E5%86%85%E7%89%88Leetcode%E8%B8%A9%E5%9D%91%E8%AE%B0%E5%BD%95.html#_3）数组越界" class="sidebar-link">3）数组越界</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/00.Coding/CodeWarehouse/part01.%E5%9B%BD%E5%86%85%E7%89%88Leetcode%E8%B8%A9%E5%9D%91%E8%AE%B0%E5%BD%95.html#_4）引用了空指针" class="sidebar-link">4）引用了空指针</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/00.Coding/CodeWarehouse/part01.%E5%9B%BD%E5%86%85%E7%89%88Leetcode%E8%B8%A9%E5%9D%91%E8%AE%B0%E5%BD%95.html#_5）leetcode上出错" class="sidebar-link">5）LeetCode上出错</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/00.Coding/CodeWarehouse/part01.%E5%9B%BD%E5%86%85%E7%89%88Leetcode%E8%B8%A9%E5%9D%91%E8%AE%B0%E5%BD%95.html#_6）出错" class="sidebar-link">6）出错</a><ul class="sidebar-sub-headers"></ul></li></ul></div></li></ul> </div> <div class="page"> <div class="content"><h1 id="part01-国内版leetcode踩坑记录"><a href="#part01-国内版leetcode踩坑记录" class="header-anchor">#</a> part01.国内版Leetcode踩坑记录</h1> <p>2020-07-25</p> <p>summary: Leetcode踩坑记录，奇怪错误记载录</p> <p>国内版本的Leetcode编码，系统似乎有些问题。记录一下</p> <blockquote><ul><li>Leetcode在类中函数编码中，并不是说一定只能在规定的函数中编码。你可以创建可以辅助你编码的全局变量，成员变量，成员函数，全局函数等（秋招和实习）也可以。</li> <li>但是要注意，名字不要和系统库中的名字冲突，以<code>C++</code>为例：虽然，编码页面只给了你那个类，让你在类的某个函数中编码。但是默认的头文件很可能是<code>#include&lt;bits/stdc++.h&gt;</code>。因为，你在函数中，想用任何<code>cmath</code>头文件，还是<code>set</code>还是<code>string</code>，随便调用。</li></ul></blockquote> <h2 id="_1）leetcode要求的函数返回值不合常理"><a href="#_1）leetcode要求的函数返回值不合常理" class="header-anchor">#</a> 1）Leetcode要求的函数返回值不合常理</h2> <p><code>961. 重复 N 次的元素</code></p> <div class="language-cpp line-numbers-mode"><pre class="language-cpp"><code><span class="token keyword">const</span> <span class="token keyword">int</span> maxn<span class="token operator">=</span><span class="token number">10000</span><span class="token operator">+</span><span class="token number">5</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> test<span class="token punctuation">[</span>maxn<span class="token punctuation">]</span><span class="token operator">=</span><span class="token punctuation">{</span><span class="token number">0</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">//上面是我加的</span>

<span class="token keyword">class</span> <span class="token class-name">Solution</span> <span class="token punctuation">{</span>
<span class="token keyword">public</span><span class="token operator">:</span>
    <span class="token keyword">int</span> <span class="token function">repeatedNTimes</span><span class="token punctuation">(</span>vector<span class="token operator">&lt;</span><span class="token keyword">int</span><span class="token operator">&gt;</span><span class="token operator">&amp;</span> A<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        
        <span class="token function">memset</span><span class="token punctuation">(</span>test<span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token keyword">sizeof</span><span class="token punctuation">(</span>test<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">int</span> len<span class="token operator">=</span>A<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>i<span class="token operator">&lt;</span>len<span class="token punctuation">;</span><span class="token operator">++</span>i<span class="token punctuation">)</span>
        <span class="token punctuation">{</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token operator">==</span>test<span class="token punctuation">[</span>A<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
            <span class="token punctuation">{</span>
                <span class="token keyword">return</span> A<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            test<span class="token punctuation">[</span>A<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span> 
        <span class="token comment">//下面这一句不加，Leetcode就会报错，但是从逻辑上，根本运行不到这</span>
        <span class="token comment">//难道Leetcode是为了防止我的代码攻击它系统嘛？？</span>
        <span class="token comment">//return -1;//没干啥的</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br></div></div><p>出现这样的错误？？？为何</p> <div class="language-txt line-numbers-mode"><pre class="language-text"><code>Line 25: Char 5: fatal error: control may reach end of non-void function [-Wreturn-type]
    }
    ^
1 error generated.
控制台 
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>查找资料找到：
正确修改：无论在什么判断条件下都可以满足函数的返回值要求。
链接：<code>https://blog.csdn.net/u012273127/article/details/79367150</code>
看完这个，所以我加了那行，不干啥，就打个过场的<code>return -1;</code></p> <h2 id="_2）内部错误"><a href="#_2）内部错误" class="header-anchor">#</a> 2）内部错误</h2> <div class="language-cpp line-numbers-mode"><pre class="language-cpp"><code><span class="token keyword">const</span> <span class="token keyword">int</span> maxn<span class="token operator">=</span><span class="token number">10000</span><span class="token operator">+</span><span class="token number">5</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> test<span class="token punctuation">[</span>maxn<span class="token punctuation">]</span><span class="token operator">=</span><span class="token punctuation">{</span><span class="token number">0</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">//上面是我加的</span>

<span class="token keyword">class</span> <span class="token class-name">Solution</span> <span class="token punctuation">{</span>
<span class="token keyword">public</span><span class="token operator">:</span>
    <span class="token keyword">int</span> <span class="token function">repeatedNTimes</span><span class="token punctuation">(</span>vector<span class="token operator">&lt;</span><span class="token keyword">int</span><span class="token operator">&gt;</span><span class="token operator">&amp;</span> A<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        
        <span class="token function">memset</span><span class="token punctuation">(</span>test<span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token keyword">sizeof</span><span class="token punctuation">(</span>test<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">int</span> len<span class="token operator">=</span>A<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>i<span class="token operator">&lt;</span>len<span class="token punctuation">;</span><span class="token operator">++</span>i<span class="token punctuation">)</span>
        <span class="token punctuation">{</span>
            test<span class="token punctuation">[</span>A<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token operator">++</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span> 
        
        <span class="token keyword">int</span> i<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>i<span class="token operator">&lt;</span>maxn<span class="token punctuation">;</span><span class="token operator">++</span>i<span class="token punctuation">)</span>
        <span class="token punctuation">{</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span>len<span class="token operator">/</span><span class="token number">2</span><span class="token operator">==</span>test<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span>
            <span class="token punctuation">{</span>
                <span class="token keyword">return</span> i<span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span> 
        <span class="token keyword">return</span> i<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br></div></div><p>有时候测试代码时总是显示“内部错误呢”，如题，提交通过，但是跑代码就是内部错误，用了一下美国的leetcode跑同一道题没问题，是不是国内服务器出啥问题了？</p> <p><strong>国内解决方式</strong>：平复一下砸电脑的心情，喝杯茶，过一会，再试试，说不定就好了（笔者，亲测有效，成功过）
原因：或许只是国内的某些判题机器有问题。&quot;内部错误&quot;还真有可能是它的内部机器有问题。。</p> <h2 id="_3）数组越界"><a href="#_3）数组越界" class="header-anchor">#</a> 3）数组越界</h2> <p>表示写的代码中，有数组越界了</p> <div class="language-txt line-numbers-mode"><pre class="language-text"><code>=================================================================
==45==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000005c at pc 0x00000039080e bp 0x7ffe3b5719f0 sp 0x7ffe3b5719e8
READ of size 4 at 0x60200000005c thread T0
    #5 0x7f992c70082f  (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
0x60200000005c is located 0 bytes to the right of 12-byte region [0x602000000050,0x60200000005c)
略掉
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p>需要检查，是否下标到达-1或者len</p> <h2 id="_4）引用了空指针"><a href="#_4）引用了空指针" class="header-anchor">#</a> 4）引用了空指针</h2> <div class="language-txt line-numbers-mode"><pre class="language-text"><code>Line 43: Char 38: runtime error: member access within null pointer of type 'Node' (solution.cpp)
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior prog_joined.cpp:74:38
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h2 id="_5）leetcode上出错"><a href="#_5）leetcode上出错" class="header-anchor">#</a> 5）LeetCode上出错</h2> <div class="language-cpp line-numbers-mode"><pre class="language-cpp"><code><span class="token keyword">class</span> <span class="token class-name">Solution</span> <span class="token punctuation">{</span>
<span class="token keyword">public</span><span class="token operator">:</span>
    <span class="token keyword">double</span> <span class="token function">myPow</span><span class="token punctuation">(</span><span class="token keyword">double</span> x<span class="token punctuation">,</span> <span class="token keyword">int</span> n<span class="token punctuation">)</span> <span class="token punctuation">{</span>

            <span class="token keyword">const</span> <span class="token keyword">double</span> eps <span class="token operator">=</span> <span class="token number">1e-6</span><span class="token punctuation">;</span>

            <span class="token keyword">if</span><span class="token punctuation">(</span> <span class="token function">fabs</span><span class="token punctuation">(</span>x<span class="token operator">-</span><span class="token number">0.0</span><span class="token punctuation">)</span><span class="token operator">&lt;</span>eps <span class="token operator">&amp;&amp;</span> n<span class="token operator">&lt;</span><span class="token number">0</span> <span class="token punctuation">)</span>
            <span class="token punctuation">{</span>
                <span class="token keyword">return</span> <span class="token number">0.00</span><span class="token punctuation">;</span><span class="token comment">//特别处理</span>
            <span class="token punctuation">}</span>

            <span class="token keyword">if</span><span class="token punctuation">(</span> <span class="token function">fabs</span><span class="token punctuation">(</span>x<span class="token operator">-</span><span class="token number">0.0</span><span class="token punctuation">)</span><span class="token operator">&lt;</span>eps <span class="token punctuation">)</span>
            <span class="token punctuation">{</span>
                <span class="token keyword">return</span> <span class="token number">0.00</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>

            <span class="token keyword">if</span><span class="token punctuation">(</span> <span class="token function">fabs</span><span class="token punctuation">(</span>x<span class="token operator">-</span><span class="token number">1.0</span><span class="token punctuation">)</span><span class="token operator">&lt;</span>eps <span class="token punctuation">)</span>
            <span class="token punctuation">{</span>
                <span class="token keyword">return</span> <span class="token number">1.00</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            
            <span class="token keyword">if</span><span class="token punctuation">(</span> <span class="token number">0</span><span class="token operator">==</span>n <span class="token punctuation">)</span>
            <span class="token punctuation">{</span>
                <span class="token keyword">return</span> <span class="token number">1.0</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>


            <span class="token keyword">int</span> tag<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">;</span><span class="token comment">//不是负数</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span> n<span class="token operator">&lt;</span><span class="token number">0</span> <span class="token punctuation">)</span>
            <span class="token punctuation">{</span>
                tag<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>
                n<span class="token operator">=</span><span class="token operator">-</span><span class="token number">1</span><span class="token operator">*</span>n<span class="token punctuation">;</span><span class="token comment">//bug出现的地方</span>
            <span class="token punctuation">}</span>

            <span class="token keyword">double</span> rt<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">;</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span> <span class="token number">1</span><span class="token operator">==</span>tag <span class="token punctuation">)</span>
            <span class="token punctuation">{</span>
                
                
                
                <span class="token keyword">while</span><span class="token punctuation">(</span> n <span class="token punctuation">)</span>
                <span class="token punctuation">{</span>
                    <span class="token keyword">if</span><span class="token punctuation">(</span> n<span class="token operator">&amp;</span><span class="token number">1</span> <span class="token punctuation">)</span>
                    <span class="token punctuation">{</span>
                        rt<span class="token operator">*=</span>x<span class="token punctuation">;</span>
                    <span class="token punctuation">}</span>

                    x<span class="token operator">*=</span>x<span class="token punctuation">;</span>
                    n<span class="token operator">&gt;&gt;=</span><span class="token number">1</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span>

            <span class="token punctuation">}</span>
            <span class="token keyword">else</span>
            <span class="token punctuation">{</span>
                
                <span class="token keyword">while</span><span class="token punctuation">(</span> n <span class="token punctuation">)</span>
                <span class="token punctuation">{</span>
                    <span class="token keyword">if</span><span class="token punctuation">(</span> n<span class="token operator">&amp;</span><span class="token number">1</span> <span class="token punctuation">)</span>
                    <span class="token punctuation">{</span>
                        rt<span class="token operator">*=</span>x<span class="token punctuation">;</span>
                    <span class="token punctuation">}</span>

                    x<span class="token operator">*=</span>x<span class="token punctuation">;</span>
                    n<span class="token operator">&gt;&gt;=</span><span class="token number">1</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span>

                rt<span class="token operator">=</span><span class="token number">1.0</span><span class="token operator">/</span>rt<span class="token punctuation">;</span>
            <span class="token punctuation">}</span>

            <span class="token keyword">return</span> rt<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br></div></div><p>显示</p> <div class="language-txt line-numbers-mode"><pre class="language-text"><code>Line 32: Char 21: runtime error: signed integer overflow: -1 * -2147483648 cannot be represented in type 'int' (solution.cpp)
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior prog_joined.cpp:42:21
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language-txt line-numbers-mode"><pre class="language-text"><code>2.00000
-2147483648
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>原因int会溢出</p> <h2 id="_6）出错"><a href="#_6）出错" class="header-anchor">#</a> 6）出错</h2> <div class="language-txt line-numbers-mode"><pre class="language-text"><code>class Solution {
public:
    double myPow(double x, int n) {

            const double eps = 1e-6;

            if( fabs(x-0.0)&lt;eps &amp;&amp; n&lt;0 )
            {
                return 0.00;//特别处理
            }

            if( fabs(x-0.0)&lt;eps )
            {
                return 0.00;
            }

            if( fabs(x-1.0)&lt;eps )
            {
                return 1.00;
            }
            
            if( 0==n )
            {
                return 1.0;
            }


            int tag=0;//表示不是 -2147483648
            
            int temp=x;

            if( n&lt;0 )
            {
                if( (~0)== n)
                {
                    tag=1;
                    n= ~(1&lt;&lt;31);//注意点
                }
                else
                {
                    n=-1*n;
                }
                
                x=1.0/x;
            }



            double rt=1;
            while( n )
            {
                if( n&amp;1 )
                {
                    rt*=x;
                }

                x*=x;
                n&gt;&gt;=1;
            }

           
            if( 1==tag )
            {
                rt*=temp;
            }

            return rt;
    }
};
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br></div></div></div> <div class="page-edit"><!----> <!----></div> <!----> </div> <!----></div></div>
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